#!/sbin/sh
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
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#
# Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
#

. /lib/svc/share/smf_include.sh
. /lib/svc/share/fs_include.sh

#
# mksavedir
# Make sure that $DUMPADM_SAVDIR is set and exists.
#
mksavedir ()
{
	[ -z "$DUMPADM_SAVDIR" ] && DUMPADM_SAVDIR=/var/crash/`uname -n`
	[ -d "$DUMPADM_SAVDIR" ] || /usr/bin/mkdir -m 0700 -p $DUMPADM_SAVDIR
}

#
# We haven't run savecore on a dump device yet
#
savedev=none

#
# If we previously crashed early in boot before dumpadm was used to configure
# an alternate dump device, then the dump is in the primary swap partition,
# which was configured as the dump device by the first swapadd early in boot.
# Thus before we run dumpadm to configure the dump device, we first run
# savecore to check the swap partition for a dump;  this is run in the
# foreground to reduce the chances of overwriting the dump.
#
# This does not apply for zfs root systems that use a zvol for dump;
# for such systems the dedicated dump device is appointed during startup
# of the filesystem/usr:default instance before any swap is added.
# Therefore we must check that the dump device is a swap device here -
# if not then we'll run savecore here in the foreground and prevent
# our dependent services coming online until we're done.
#

rootiszfs=0
alreadydedicated=0

readmnttab / </etc/mnttab
if [ "$fstype" = zfs ] ; then
	rootiszfs=1
	if [ -x /usr/sbin/dumpadm ]; then
		if /usr/sbin/dumpadm 2>/dev/null | grep "Dump device:" | \
		    grep '(dedicated)' > /dev/null 2>&1; then
			alreadydedicated=1
		fi
	fi
fi

if [ -x /usr/bin/savecore -a \
    \( ! $rootiszfs -eq 1 -o $alreadydedicated -eq 0 \) ]; then
	[ -r /etc/dumpadm.conf ] && . /etc/dumpadm.conf

	if [ "x$DUMPADM_ENABLE" != xno ] && mksavedir; then
		/usr/bin/savecore $DUMPADM_SAVDIR
		shift $#
		set -- `/usr/sbin/dumpadm 2>/dev/null | /usr/bin/grep 'device:'`
		savedev=${3:-none}
	else
		#
		# dumpadm -n is in effect, but we can still run savecore
		# to raise an event with initial panic detail extracted
		# from the dump header.
		#
		/usr/bin/savecore -c
	fi
fi

if [ ! -x /usr/bin/savecore ]; then
	echo "WARNING: /usr/bin/savecore is missing or not executable" >& 2
fi

#
# Now run dumpadm to configure the dump device based on the settings
# previously saved by dumpadm.  See dumpadm(8) for instructions on
# how to modify the dump settings.
#
if [ -x /usr/sbin/dumpadm ]; then
	/usr/sbin/dumpadm -u || $SMF_EXIT_ERR_CONFIG
else
	echo "WARNING: /usr/sbin/dumpadm is missing or not executable" >& 2
	exit $SMF_EXIT_ERR_CONFIG
fi

if [ -r /etc/dumpadm.conf ]; then
	. /etc/dumpadm.conf
else
	echo "WARNING: /etc/dumpadm.conf is missing or unreadable" >& 2
	exit $SMF_EXIT_ERR_CONFIG
fi

#
# If the savecore executable is absent then we're done
#
if [ ! -x /usr/bin/savecore ]; then
	exit $SMF_EXIT_ERR_CONFIG
fi

#
# Now that dumpadm has reconfigured /dev/dump, we need to run savecore again
# because the dump device may have changed.  If the earlier savecore had
# saved the dump, savecore will just exit immediately.
#

isswap=0
swapchanged=0
if /usr/sbin/swap -l 2>/dev/null | grep "^${DUMPADM_DEVICE} " \
	    >/dev/null 2>&1; then
	isswap=1
	if [ "x$savedev" != "x$DUMPADM_DEVICE" ]; then
		swapchanged=1
	fi
fi

if [ "x$DUMPADM_ENABLE" != xno ]; then
	if [ $isswap -eq 1 ]; then
		#
		# If the dump device is part of swap, we only need to run
		# savecore a second time if the device is different from the
		# swap device on which we initially ran savecore.
		#
		if [ $swapchanged -eq 1 ]; then
		    mksavedir && /usr/bin/savecore $DUMPADM_SAVDIR &
		fi
	else
		#
		# The dump device couldn't have been dedicated before we
		# ran dumpadm, so we must execute savecore again.
		#
		mksavedir && /usr/bin/savecore $DUMPADM_SAVDIR &
	fi
else
		#
		# savecore not enabled.  Check whether a valid dump is
		# present on the device and raise an event to signal that,
		# but avoid sending a duplicate event from the savecore -c
		# earlier.
		#
		if [ $isswap -eq 0 -o $swapchanged -eq 1 ]; then
			/usr/bin/savecore -c
		fi
fi

exit $SMF_EXIT_OK
